DC’s 1941 master plan is available through the Library of Congress. Published just months before Pearl Harbor, the plan is a fascinating look at the future pre-war planners envisioned.

The National Mall extends eastward to the bank of the Anacostia and dominates the plan. “Semi-public buildings,” parking garages, and much more highway-like Constitution and Independence Avenues line the new Mall. On the other hand, Southwest retains its historic street grid, and isn’t cut off by I-395.